Safariland Model 775 Slimline Open Top Triple Magazine Pouch, For 2.25 Duty Belts, Fits Glock 17, Belt Loop, Hardshell STX, STX Tactical Black Finish 775-83-13 Model 775 Slimline Open Top Triple Magazine Pouch is designed to carry three magazines on a 2.25" (58mm) duty belt. The 775 features both vertical and horizontal belt slots" allowing it to ride in either a vertical or low-profile horizontal position*. A magazine tension screw located between the two pouches allows for easy retention adjustment.